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OpenStudy (anonymous):
Determine the concavity of the function (using a sign chart) of the function y=4x^3+21x^2+36x-20
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OpenStudy (anonymous):
I got positive on both sides of the second derivative's zero, so I think I did something wrong
OpenStudy (anonymous):
Oh wait
OpenStudy (anonymous):
I think I plugged int he wrong value
OpenStudy (anonymous):
nevermind
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